~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/wireless/lib80211.c

Version: ~ [ linux-5.9 ] ~ [ linux-5.8.14 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.70 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.150 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.200 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.238 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.238 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * lib80211 -- common bits for IEEE802.11 drivers
  4  *
  5  * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com>
  6  *
  7  * Portions copied from old ieee80211 component, w/ original copyright
  8  * notices below:
  9  *
 10  * Host AP crypto routines
 11  *
 12  * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
 13  * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
 14  *
 15  */
 16 
 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 18 
 19 #include <linux/module.h>
 20 #include <linux/ctype.h>
 21 #include <linux/ieee80211.h>
 22 #include <linux/errno.h>
 23 #include <linux/init.h>
 24 #include <linux/slab.h>
 25 #include <linux/string.h>
 26 
 27 #include <net/lib80211.h>
 28 
 29 #define DRV_NAME        "lib80211"
 30 
 31 #define DRV_DESCRIPTION "common routines for IEEE802.11 drivers"
 32 
 33 MODULE_DESCRIPTION(DRV_DESCRIPTION);
 34 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
 35 MODULE_LICENSE("GPL");
 36 
 37 struct lib80211_crypto_alg {
 38         struct list_head list;
 39         struct lib80211_crypto_ops *ops;
 40 };
 41 
 42 static LIST_HEAD(lib80211_crypto_algs);
 43 static DEFINE_SPINLOCK(lib80211_crypto_lock);
 44 
 45 static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info,
 46                                           int force);
 47 static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info);
 48 static void lib80211_crypt_deinit_handler(struct timer_list *t);
 49 
 50 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 51                                 spinlock_t *lock)
 52 {
 53         memset(info, 0, sizeof(*info));
 54 
 55         info->name = name;
 56         info->lock = lock;
 57 
 58         INIT_LIST_HEAD(&info->crypt_deinit_list);
 59         timer_setup(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler,
 60                     0);
 61 
 62         return 0;
 63 }
 64 EXPORT_SYMBOL(lib80211_crypt_info_init);
 65 
 66 void lib80211_crypt_info_free(struct lib80211_crypt_info *info)
 67 {
 68         int i;
 69 
 70         lib80211_crypt_quiescing(info);
 71         del_timer_sync(&info->crypt_deinit_timer);
 72         lib80211_crypt_deinit_entries(info, 1);
 73 
 74         for (i = 0; i < NUM_WEP_KEYS; i++) {
 75                 struct lib80211_crypt_data *crypt = info->crypt[i];
 76                 if (crypt) {
 77                         if (crypt->ops) {
 78                                 crypt->ops->deinit(crypt->priv);
 79                                 module_put(crypt->ops->owner);
 80                         }
 81                         kfree(crypt);
 82                         info->crypt[i] = NULL;
 83                 }
 84         }
 85 }
 86 EXPORT_SYMBOL(lib80211_crypt_info_free);
 87 
 88 static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info,
 89                                           int force)
 90 {
 91         struct lib80211_crypt_data *entry, *next;
 92         unsigned long flags;
 93 
 94         spin_lock_irqsave(info->lock, flags);
 95         list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) {
 96                 if (atomic_read(&entry->refcnt) != 0 && !force)
 97                         continue;
 98 
 99                 list_del(&entry->list);
100 
101                 if (entry->ops) {
102                         entry->ops->deinit(entry->priv);
103                         module_put(entry->ops->owner);
104                 }
105                 kfree(entry);
106         }
107         spin_unlock_irqrestore(info->lock, flags);
108 }
109 
110 /* After this, crypt_deinit_list won't accept new members */
111 static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info)
112 {
113         unsigned long flags;
114 
115         spin_lock_irqsave(info->lock, flags);
116         info->crypt_quiesced = 1;
117         spin_unlock_irqrestore(info->lock, flags);
118 }
119 
120 static void lib80211_crypt_deinit_handler(struct timer_list *t)
121 {
122         struct lib80211_crypt_info *info = from_timer(info, t,
123                                                       crypt_deinit_timer);
124         unsigned long flags;
125 
126         lib80211_crypt_deinit_entries(info, 0);
127 
128         spin_lock_irqsave(info->lock, flags);
129         if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) {
130                 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
131                        "deletion list\n", info->name);
132                 info->crypt_deinit_timer.expires = jiffies + HZ;
133                 add_timer(&info->crypt_deinit_timer);
134         }
135         spin_unlock_irqrestore(info->lock, flags);
136 }
137 
138 void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info,
139                                     struct lib80211_crypt_data **crypt)
140 {
141         struct lib80211_crypt_data *tmp;
142         unsigned long flags;
143 
144         if (*crypt == NULL)
145                 return;
146 
147         tmp = *crypt;
148         *crypt = NULL;
149 
150         /* must not run ops->deinit() while there may be pending encrypt or
151          * decrypt operations. Use a list of delayed deinits to avoid needing
152          * locking. */
153 
154         spin_lock_irqsave(info->lock, flags);
155         if (!info->crypt_quiesced) {
156                 list_add(&tmp->list, &info->crypt_deinit_list);
157                 if (!timer_pending(&info->crypt_deinit_timer)) {
158                         info->crypt_deinit_timer.expires = jiffies + HZ;
159                         add_timer(&info->crypt_deinit_timer);
160                 }
161         }
162         spin_unlock_irqrestore(info->lock, flags);
163 }
164 EXPORT_SYMBOL(lib80211_crypt_delayed_deinit);
165 
166 int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops)
167 {
168         unsigned long flags;
169         struct lib80211_crypto_alg *alg;
170 
171         alg = kzalloc(sizeof(*alg), GFP_KERNEL);
172         if (alg == NULL)
173                 return -ENOMEM;
174 
175         alg->ops = ops;
176 
177         spin_lock_irqsave(&lib80211_crypto_lock, flags);
178         list_add(&alg->list, &lib80211_crypto_algs);
179         spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
180 
181         printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n",
182                ops->name);
183 
184         return 0;
185 }
186 EXPORT_SYMBOL(lib80211_register_crypto_ops);
187 
188 int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops)
189 {
190         struct lib80211_crypto_alg *alg;
191         unsigned long flags;
192 
193         spin_lock_irqsave(&lib80211_crypto_lock, flags);
194         list_for_each_entry(alg, &lib80211_crypto_algs, list) {
195                 if (alg->ops == ops)
196                         goto found;
197         }
198         spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
199         return -EINVAL;
200 
201       found:
202         printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n",
203                ops->name);
204         list_del(&alg->list);
205         spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
206         kfree(alg);
207         return 0;
208 }
209 EXPORT_SYMBOL(lib80211_unregister_crypto_ops);
210 
211 struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name)
212 {
213         struct lib80211_crypto_alg *alg;
214         unsigned long flags;
215 
216         spin_lock_irqsave(&lib80211_crypto_lock, flags);
217         list_for_each_entry(alg, &lib80211_crypto_algs, list) {
218                 if (strcmp(alg->ops->name, name) == 0)
219                         goto found;
220         }
221         spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
222         return NULL;
223 
224       found:
225         spin_unlock_irqrestore(&lib80211_crypto_lock, flags);
226         return alg->ops;
227 }
228 EXPORT_SYMBOL(lib80211_get_crypto_ops);
229 
230 static void *lib80211_crypt_null_init(int keyidx)
231 {
232         return (void *)1;
233 }
234 
235 static void lib80211_crypt_null_deinit(void *priv)
236 {
237 }
238 
239 static struct lib80211_crypto_ops lib80211_crypt_null = {
240         .name = "NULL",
241         .init = lib80211_crypt_null_init,
242         .deinit = lib80211_crypt_null_deinit,
243         .owner = THIS_MODULE,
244 };
245 
246 static int __init lib80211_init(void)
247 {
248         pr_info(DRV_DESCRIPTION "\n");
249         return lib80211_register_crypto_ops(&lib80211_crypt_null);
250 }
251 
252 static void __exit lib80211_exit(void)
253 {
254         lib80211_unregister_crypto_ops(&lib80211_crypt_null);
255         BUG_ON(!list_empty(&lib80211_crypto_algs));
256 }
257 
258 module_init(lib80211_init);
259 module_exit(lib80211_exit);
260 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp